Add Latency to a Lab Network

Looking for suggestions here. Essentially I am trying to pin down latency as an affect on a specific application,

Anyway, I have a bench network with a couple of nodes, and I want to introduce latency between the Nodes. I have a couple of options on hardware at my disposal (HP and Enterasys full L3 switches, as well as an older Nortel L3 router). Also all kinds of pc hardware.

I was thinking of just creating a L2 loop, but I feel that there is wuite a lack of control at that point

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